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Image Based local strain measurement of wood
Department of Engineering Design, Tampere University of Technology, P.O. Box 589, FI-33101 Tampere, Finland .
Department of Engineering Design, Tampere University of Technology, P.O. Box 589, FI-33101 Tampere, Finland .
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering. (High yield pulping technology)ORCID iD: 0000-0003-3381-5516
Department of Automation Science and Engineering, Tampere University of Technology, P.O. Box 692, FI-33101 Tampere, Finland .
2013 (English)In: Conference Proceedings of the Society for Experimental Mechanics Series, 2013Conference paper, Published paper (Refereed)
Abstract [en]

A new method for local strain measurement of soft materials like wood is proposed. Norway spruce samples were subjected to radial compression in an encapsulated split-Hopkinson device (ESHD). High speed photography was used at two magnifications for image based analysis. The strain estimation was made from high magnification images showing compression on local, fiber level for 1-2 growth rings and from low magnification images showing compression on sample level, for 5-8 growth rings. Strain gauges on the ESHD bars give stress and average strain for comparison. Image analysis based on PIV technique gives local and average strain propagation as a function of time. Wood is an inhomogeneous material and thus, local strain is a more proper measure of the response of the material. The high magnification captures differences between earlywood and latewood while the low magnification gives the strain distribution over the whole sample. Both magnifications are important in order to understand the response of the wood material to the sudden compression. A way to estimate the stress field was developed. The results showed similarity to the strain gauge measurement results. © The Society for Experimental Mechanics, Inc. 2014.

Place, publisher, year, edition, pages
2013.
Keyword [en]
Image based measurement, Local strain, Mechanical pulping, Split-Hopkinson bar, Wood
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-20674DOI: 10.1007/978-3-319-00768-7_44Scopus ID: 2-s2.0-84886740956ISBN: 9783319007670 (print)OAI: oai:DiVA.org:miun-20674DiVA: diva2:678857
Conference
2013 Annual Conference on Experimental and Applied Mechanics; Lombard, IL; United States; 3 June 2013 through 5 June 2013; Code 100466
Note

Source: Scopus

Available from: 2013-12-13 Created: 2013-12-13 Last updated: 2013-12-18Bibliographically approved

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CiteExportLink to record
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Citation style
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